Shortly after the death of Roman emperor Constantius II, his successor Julian held a tribunal at the city of Chalcedon, which was then a suburb of Constantinople.
Saturninius Secundus Salutius, who was raised to the rank of Praetorian Prefect was given the chief oversight and with him were associated Claudius Mamertinus (another civilian), and four military commanders, Arbitio, Agilo, Nevitta and Jovinus.
[1] At this tribunal a large part of Constantius's ministers were brought to trial.
In charge of the daily inquisitions was Arbitio, "while the others were present merely for show" according to historian Ammianus Marcellinus.
Constantius II died on 3 November 361, so all this must have happened in late 361 and early 362.